Correct Example Parameter and Output Property

[ps-gregg]

Description

The three examples for Update-AzSqlServerVulnerabilityAssessmentSetting showed EmailSubscriptionAdmins as the parameter and output property which is incorrect. The parameter name is EmailAdmins and the property returned in the output is EmailAdmins.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • the markdown help files have been regenerated using the commands listed here

[VeryEarly]

please add one entry in src/Sql/Sql/ChangeLog.md to specify your change

[msftclas]

All CLA requirements met.

[VeryEarly]

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